i actually accidentally turned my dobro into a sitar
for a while... here's what i discovered:
sound is, to my knowledge and as hinted to in previous posts here, created by the strings passing across a wide, almost flat bridge, rather than a thin "pin point" bridge like a regular guitar. to accomplish this, you can just replace your bridge with something that fits that description.
it's a little bizarre, but i cut the magnet off of an old car stereo speaker (a 6x9), and used that as the biscuit bridge in my dobro. without an actual bridge, the strings ran right across the flat back of the magnet and made the most wonderful and eerily authentic accidental sitar
my 2 cents, anyway. it's always fun to screw around with stuff like that and see what sounds you can come up with, cause they can often times be a serendipitous source for musical inspiration.